Selective system.



LPPLIUATION FILED MAB..15,1906.

Y PATENTED NOV. 6, 1906. W. R. WHITEHORNE. SELECTIVE SYSTEM.

3-SHEETS-SHEET l.

PATENTED NOV. 6 1906. W. R. WHITEHORNE. SELECTIVE SYSTEM.

APPLICATION FILED MAR.16. 1906.

3 SHEETS-SHEET 2.

aw i

Fina PATENTED NOV. 6, 1906. W. R. WHITEHORNE.

SELECTIVE SYSTEM.

APPLICATION FILED MAR.15,1906.

3 SHEETS-SHEET 3.

WILLIAM R. WHITEHORNE,

OF ONE-HALF TO BARRY OF BETHLEHEM, PENNSYLVANIA, ASSIGNOR M oNUTT, OF BETHLEHEM, PENNSYLVANIA.

SELECTIVE SYSTEM- SpeciflcationofLetters Patent.

ratented Nov. 6 1906.

Application 51m M h 15,190 Serial No. 806,?

To all whom, it may concern.-

Be it'known that I, WE IA 'R'WHITE HORNE, a citizen of ,theUnited seaweed Bethlehem, Pennsylvania',i have inin m veited certain Im rovern'ents in Selective Systems, of which t e-following is a specification.

. One obj ect of the invention is to provide a system having itsapparatus so arran ed that by the manipulatioflof a suitable switch at a electromagnetic device central station the v (in the present case a bell of any 'oneof a number of instruments) may be operated Without operating the bells or other devices of the other instruments connected on the samecircuit.

Another object of the invention is to provide a system of the above-notedclass with a novel form of electrical shall be so made as .to have a plurality of paths and windings for its magnetic circuit, its design and construction being such that it will ring only when the magnetic flux exists in a predetermined volumeand direction in a definite one of the pathsprovided.

It is also desired to-provide novel means for preventing the flow of any direct current through the apparatus for attaining the above-noted advantageous ends, which means shall also serve to prevent the flow of direct current from .theline-'wires to the ground.

It is a further object of the invention to secure a selective telephone system of the general characternoted above without the use of automatic switches scribers instruments.

These objects, together with other-advantageous results, are-attained as hereinafter set forth, reference being had tothe accompanying drawings, in wh1ch i Figure 1 is a diagrammatic view-illustrating the apparatus and connections constituting the preferred form- "of the invention. Figs. 2 to 7, inclusive, are diagrammatic views illustrating the connections made by the operation'of the central operators switch for operating each of the six instruments on the particular telephone-circuit shown. Fig. 8 is a perspective view illustrating the preferred arrangement and constructlon of one of the bells employed; and Fig. 9

at the various subnumber of su ed and connected the line-Wires in a speclal manner, as W111] signal bell which may be connected to each is a dia-- 'grammaticview' similar, to Fig. 1, illustrating the instruments and connections constituting a modified form of my invention.

In carrying) out the invention any desired are connected to a single pair of line conductors, there being a ground connection for each of the instruments, and at a central sta tion a multipoint-switch with an alternatingcurrent these su scribe'rs without operating the ringing ap aratus of any of the other In order that t e various instruments may answer the above re uirements, we provide at each of them a be 1 whose o crating-coils. are mounttween the ground and hereinafter be set fort In the above drawings, A is a multipointswitch, consisting in'the present. instance of six ringingswitches a, to at, inclusive, one for each subscriber connected to the-line, and having their connections arranged so that allor certain ones of five mains 1, 2, 3, 4, and '5 other in various combinations. The first of these mains is permanently grounded, while mains 2 and 3 are respectively connected to the terminals of any source of altenating current, in the present instance a transformer a"; The first switch a is constructed to connect together the mains 1 and 2 and simultaneously to connect both of the mains 4 and 5 to the main 2, it being'notedthat the conductors 6 and 7, forming the metallic portion of the telephone-circuit, are respectively connected to the mains 4 and 5.

The switch a has its contacts so arranged that the main 1 may be simultaneously connected to the mains 2 and 4 at the same time that the main 3 is connected to the main 5. By switch a mains 3 and 4 may be connect: ed to each other, and at the same time mains 1 and 5 may both be connected to main Switch a is constructed to connect mains 3 and 4. together at the same time mains 1 and 2 are connected to each other, while switch a when operated connects mains 3 and 5 and 1 and 2, respectively. The operation of the switch a connects mains 3 and 5 and 2 and 4, respectively.

Connected between the two line-Wires 6' generator for ringing up any one ofscribers instrumentsfup'to six in Fig. 8.

and 7 and the ground are six instruments B BB the telephone-transmittersb and the receivers b, with their associated apparatus, being arranged in the well-known manner. In order to avoid confusion, the telephone apparatus has been shown in connection with the signaling instrumentB only, though it is to be understood that in the presentinstance there is a similar apparatus connected to each of the instruments B B B".

For the ringing apparatus of each instrument there is provided a bell D, employing a plurality of coils, there being in the case of the instruments B, B, and B two of-these coils d and d and in the case of the instruments B B, and B a third coil (1 Each of the instruments B, B, and B is provided with a balance or compensating coil (1 of a resistance substantially the same as that of either of the coils d or d and having one of its terminals connected in every case to one plate of a three-way condenser C. the other two plates of which are connected to the coils d and d, respectively. These balance-coils are used because it has been found that when properly proportioned relatively to. the other windings of the circuit they cause the most satisfactory distribution of current throughout the system. In the case of the instruments B B and B the coils d, d, and d each have one terminal connected to one of the plates of a three-way condenser C, while the other terminals are connected to the mains 6 and 7 and to the ground. The framework forming the magnetic circuit of tnc bell-coils is of a peculiar construction in that it consists of two cores connected by pole-pieces d, and these latter are extended along one side of said cores to form substantially triangular extensions d, serving as secondary pole-pieces, as shown best It will be understood that the above cores and pole-pieces are of magnetic material and that the adjacent ends of the auxiliary pole-pieces have extending between them the bell-armature (1 this latter being pivotally supported on pointed screws carried in any suitable manner by a supporting-plate d of non-magnetic material, which in turn is carried by the pole-pieces d. The armature has fixed to it the bellclapper, (indicated in dotted lines at (1",) and the bellgongs d are preferably carried on rods d, which may, as in the present instance, extend through the auxiliary pole-pieces d and serveas supporting means for the plate d.

In the case of the instruments B, B", and B the coils d and d are wound, respectively, on the two cores, while in the case of the re maining three instruments one coil (1 is wound on one core and two other coils d and d on the other core, as indicated diagrammatically in Figs. 2 to 7, inclusive.

from one of the cores through pole-piece d to the second core, through the second polepiece (1 and to the first core. As a result none of but little of the magnetic flux passes throu h the auxiliary pole-pieces d", and

there is consequently no operation of the armature d It may be desirable in order to prevent humming or slight vibration of the armature to retain it in a definite position by means of a spring d. In the second case, however, the magnetic flux passes out of both magnet-cores into one of the polepieces (1 and flows to the auxiliary pole-piece d, forming a part thereof, thence to the armature d, to the second auxiliary pole-piece d", to the second pole-piece (i forming a part thereof, and back to the two cores. In this case, since alternating current is supplied to the core-windings, the armature d is oscillated upon its pivot-screws and the bellgongs cl are alternately struck by the-clapper d The windings of the bells of instruments B", B and B are so proportioned and connected that the coil d on one of the cores and either of the coils'on the other core may be so energized as to form similar poles at the same ends, in'which case the magnetic flux is compelled to pass through the auxiliary poleieces d and the armature (1 so as to oscilate the latter. On the other hand, however, the two coils d and (1 may be so energized as to neutralize each other, or one of them may be connected to neutralize'the greater art of the effect of the coil (1, in either of Whic cases there will be no magnetic flux passing through the auxiliary pole-pieces d.

Switches a to 0 inclusive, are connected. to take advantage of the above-described arrangement of the bell-coils and their respective'magnetic circuits, so that if it be desired to ring up the instrument B to the exclusion of the others connected on the mains 6 and 7 the switch a will be operated to close its contacts, in which case one of the terminals of the transformer a is connected to the ground, whilethe other is connected to the two Windings d and d of said instrument in such man ner that the magnetic flux is caused to pass through the auxiliary pole-pieces d, and con sequently result in the ringing of their bell. The remaining five instruments will not be rung, for in the case of the coils of instruments B and B the connections are such that the magnetic flux simply passes in a short or closed magnetic circuit through the The coils of the instruments B, B, and B main pole-pieces (1" without being forced to ICC eaaaee v 3 pass through the auxiliary pole-pieces d. In operation of said member on any one of said 65 the case of the coils of instruments B B instruments withoutoperatlng the members and B the two windings d and d neutralize of the other instruments, substantially as deeach other, so that as a consequence the scribed. winding d produces a flux which-passes solely 4.- A system including a two-conductor through the magnet-cores and the main poleline, a, plurality of instruments connected 70 pieces (Z thereto, each instrument having an electro- It is obvious that the number of instrumagnetic signaling device provided with a ments connected on a single two-conductor plurality of paths for the magnetic flux, a line may be doubled by the use of a pulsating plurality of windings for each of said devices,

ringing-current instead ofan alternating'curan operating member .for each device m-V 75 rent, though in practice it is thought that cluded in but one of the paths for the magthe smaller number of instruments would be netic flux thereof, and means for causing opall that it is desirable to connect on such a eration .of the. signal-operating member of I 5 single line. If such a pulsating current were any one of said instruments at will, substan- I used, the three-way condensers would be tially as described. 8o omitted from the system and the various 5. A- system including a two-conductor lines directly connected at the points where line, a plurality of instruments connected the condensers had been previouslyused, as thereto, each having an electromagnetic sigis shown in Fig. 9.: As will be understood naling device provided with a plurality of by those skilled in the art, the different bells paths for the magnetic flux, each signaling 8 5 would be suitably polarized to meet the device including a plurality of windings conabove-noted conditions and a generator a nectedbetween the ground and the two line provided of the necessary design'and conoonductors, an'operating member for each of struction. said signaling-devices included in but one, of

While the invention is shown and dethe paths for the magneticflux, with means scribed as used in connection with a teleat acentral station for controlling the ourphone system, it is obvious that it may with-- rent-flow through the windings of the signalout material, change be employed as part'of ing devices whereby the signal-o crating 0 any system of a paratusin which it is desirmember of but one of said devices wi 1 be opable to electrica ly control or cause the opererated, substantially as'described.

' ation of a definite one or .a' number of instru- 6. A system including aline, a plurality of" ments from a c ntral station through the meinstruments connected thereto, each having dium of a minimum number of conducto z. an electromagnetic signaling deyiceprovided 3 5 I claim with a plurality of ether for the magnetic 1, A system consisting of a plurality of flux, and each inclu g a plurality of wind- 00' electromagnetic devices each having a magin'gs connected between the ground and the netic circuit constructed with a-plurality of line, an operating member f0 each of said paths for the magnetic flux and having an signaling devicesincluded in but one of the 0 operating member included in but one of the paths for the magnetic flux, means at'a cenpaths, with means for causing at will'the optral station forcontrolling the current-flow 1o: eration of said member on any one of said inthrough the of the signaling devices struments without operating the members of whereby any signa opera-ting member of the other instruments, substantially as debut one ofsaid devices may be operated,

5 scribed. v witha three-way mndenserinterposed be 2. A system consisting of a.plurality of setween the win and the ground, substan- 1 I0 lective-switches at a central'station, a curtially as describe L t rent-generator,a plurality of electromag s 7. Asystem-including an alternating-cue.

netic devices, and a line having conductors" rent generator, in two-conductor line, a'mul- 5o connecting the devices with the switches and ti ointeswitclifor generator, each of said devices havingamag of V netic circuit provided with windings connectground In a number of difierent combinations, ed to the line and including auxiliary and a plurality ofinstruments connected to the main poleieces, an armature included 'in line, an electromagnetic signalin device for 55 the magnetic circuit ofsaid auxiliary poleeachinstrument constructed to have a plupieces only and mechanism actuated by said rality of paths for. the magnetic flux, and a armature, substantially as described. signal-operating member included in but one A system including a plurality of inof said paths, each 0' the signaling devices struments connected on the same line, each having a plurality of windings connected be- 60 instrument having an electroma etic sigtween the line conductors and the ground in naling device provided with a lii rality .of a mannerdiflerent in each instrument, sub- 12 5 paths for the magnetic flux, and having an stantially as described. operating member included in but one of 8. A system including an alternating-cursaid paths, with means for causing at will the rent generator, a two-conductor line, a multipoint-switch for connecting the terminals or said generator to the line and to the ground in a number of different combinations, a plurality of instruments connected to the line, an electromagnetic signaling device for each instrument constructed to have a plurality of paths for the'magnetic flux, and a signal-operating member included in but one of said paths, each of the signaling de vices having a plurality of windings connected between the line conductors and the ground in a manner different in each instrument, with a three-Way condenser con nectedbetween the ground and the lineconductors at each instrument, substantially as described.

9. A system consisting of a plurality of instruments, a number of switches at'a central station, a current-generator, and a line having conductors connecting said switches and generator with the instruments, each of said instruments including a signaling device composed of a plurality of coresprovided with windings connected to the conductors of the line and to the ground, main'pole-pieces joining said cores to complete the magnetic circuit thereof, and auxiliary pole-pieces for providing a second path for the. magnetic flux set up by the winding, an armature included in the magnetic circuit of said auxiliary pole-pieces, and signaling means actuated by said armature, substantially as de-1 scribed.

10. A system including a plurality of eletrically-actuated instruments'each provided with a signaling device, a line connected to said instruments, a current-generator, and a plurality of switches for connecting said generator to the conductors of the line and to the ground in different combinations and connect ons, each of the signaling devices of said intruments consisting of a framework of magnetic material having main pole-pieces connected by cores, and auxiliary pole-pieces placed adjacent to the cores, windings on said cores connected to the line conductors and to the ground, an oscillatory armature supported adjacent to the auxiliary polepieces so as to be included in their magnetic circuit, a bell, and a clapper therefor con-- ssaeee nected to said armature, substantially as de scribed.

11, A system consisting of a two-conductor line, a source of current, means for connecting said source to either of said. conductors and to the ground or to both conductors independently of the ground, a three-way condenser, and connections from the plates of said condenser to the line conductors and ground respectively, substantially as described 12. A system consisting of a two-conductor line, a source of current, means for connecting said source to either or both of said conductors and to the ground, and a plurality of instruments each having connections to the two line conductors, with a three-way con denser having two of its plates respectively connected to the said line conductors and in multiple to the instruments, and its third plate connected to the ground, substantially as described. I

13'. A system consisting of a plurality of magnets each having a plurality of windings, said magnets having frames providing a p-luralityof paths for the magnetic flux, an armature for each magnet placed to be included in but one of SQddil'llXPSLhllS, with means for causing at will simultaneous energization of the windings of any magnet or magnets to cause actuation of the armature or armatures thereof, substantially as described.

14-. A system consisting of a plurality of magnets each having a plurality of windings, said magnets having frames each providing a plurality of paths for the magnetic flux, an ar mature for each magnet placed to be included in but one of said said flux-paths, and aserics of switches'respectively connected to cause at will the actuation of the armatures of definite ones of said magnets, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM R. WHITEHORNE.

Witnesses HELEN E. Nnirnnonun, R. W. LEIBERT. 

